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Javascript Regular Expressions

By : Loiane Groner, Gabriel Manricks

4 (7)

Javascript Regular Expressions

4 (7)

By: Loiane Groner, Gabriel Manricks

Overview of this book

This book is ideal for JavaScript developers and programmers who work with any type of user entry data and want sharpen their skills to become experts.

Preface

Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Free Chapter

1. Getting Started with Regex

1. Getting Started with Regex

It's all about patterns

Regex in JavaScript

Building our environment

Summary

2. The Basics

2. The Basics

Defining vague matchers in Regex

Defining ranges in Regex

Defining multipliers in Regex

Defining custom quantifiers

Matching alternated options

Creating a Regex for a telephone number

Summary

3. Special Characters

3. Special Characters

Nonvisual constraints

Defining nongreedy quantifiers

Matching groups in Regex

Summary

4. Regex in Practice

4. Regex in Practice

Regular expressions and form validation

Validating fields

Manipulating data

Summary

5. Node.js and Regex

5. Node.js and Regex

Setting up Node.js

Getting started with our application

The anatomy of an Apache log file

Summary

A. JavaScript Regex Cheat Sheet

A. JavaScript Regex Cheat Sheet

Character classes

Character sets

Boundaries

Grouping, alternation, and back reference

Quantifiers

JavaScript regular expressions methods

Index

Index

Customer Reviews

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Boundaries

In the following table, you can find the patterns for boundaries, which will tell the Regex what position to do the matching in.

Pattern	Description	Example
`^`	This matches the beginning of an input. If the multiline flag is set to true, it also matches immediately after the (`\n`) line break character.	`/^ The/` matches "The" in "The stars", but not "In The stars".
`$`	This matches the end of an input. If the multiline flag is set to true, it also matches immediately before the (`\n`) line break character.	`/`and`$/` matches "and" in "land", but not "and the bar".
`\b`	This matches any word boundary (test characters must exist at the beginning or at the end of a word within the string).	`/va\b/` matches "va" in "this is a java script book", but not "this is a javascript book".
`\B`	This matches any non-word boundary.	`/va\B/` matches "va" in "this is a JavaScript book...

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CONTINUE READING

83

Tech Concepts

36

Programming languages

73

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